Pre-saturation phase in the frustrated ferro-antiferromagnet Pb2VO(PO4)2
Abstract
Magnetization, magnetic torque, neutron diffraction and NMR experiments are used to map out the H-T phase diagram of the prototypical quasi-two-dimensional ferro-antiferromagnet Pb2VO(PO4)2 in magnetic fields up to 27 T. When the field is applied perpendicular to the axis of magnetic anisotropy, a new magnetic state emerges through a discontinuous transition and persists in a narrow field range just below saturation. The measured NMR spectra suggest a complex and possibly incommensurate magnetic order in that regime.
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